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Work at IPN Orsay R&D on Calorimeters Jean Peyré Dec 2007

Work at IPN Orsay R&D on Calorimeters Jean Peyré Dec 2007. 1: R&D Status at IPNO. Prototypes for Calorimeter. CsI(Tl) Crystals received from Scionnix. Dual Square PMTs (1 per 2 crystals) received from Photonis (3 PMT 9 stages). 1: Xtals received from Scionnix. Crystal #2. Crystal #1.

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Work at IPN Orsay R&D on Calorimeters Jean Peyré Dec 2007

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  1. Work at IPN Orsay R&D on Calorimeters Jean PeyréDec 2007 IPNO-RDD-Jean Peyré

  2. 1: R&D Status at IPNO Prototypes for Calorimeter CsI(Tl) Crystals received from Scionnix DualSquare PMTs (1 per 2 crystals) received from Photonis (3 PMT 9 stages) IPNO-RDD-Jean Peyré

  3. 1: Xtals received from Scionnix Crystal #2 Crystal #1 Frustum Crystals #2 have been send back to Scionnix for non conformity Reference Crystals #1 are kept for Xtalk tests IPNO-RDD-Jean Peyré

  4. 1: Xtals ordered from other manufacturers New crystals ordered :- Amcrys (Russia) and SICCAS (China) Standard crystal 110mm long and lengthened crystal 140mm long to be able to protect PMT against Magnetic field with mmetal IPNO-RDD-Jean Peyré

  5. 1: PMT’s saw line 3mm +saw line 2mm 3mm 3 PMT’s -1 with window thickness 3mm -1 with window thickness 2mm -1 with window thickness 3mm + saw line IPNO-RDD-Jean Peyré

  6. CH1 CH2 CH1 CH2 1: PMT’s- measure of Crosstalk We want to measure the Crosstalk between the two channels of the PMT when placing a crystal in front of one of the two channels. Case A S1a=G1*NbPhé1a S2a=G2*NbPhé2a NbPhé= Number of Photoélectrons created on each part of the photocathode & collected by first dynode G= global Gain for each Channel (PMT+ChargePream+Shaper) S= signal for each channel CH Cross-Talk CH1->CH2 NbPhé2a/NbPhé1a=S2a/S1a*G1/G2 Case B S1b=G1*NbPhé1b S2b=G2*NbPhé2b Cross-Talk CH2->CH1 NbPhé1b/NbPhé2b=S1b/S2b*G2/G1 IPNO-RDD-Jean Peyré

  7. 1: PMT’s- measure of Crosstalk Cross-Talk CH2->CH1 Cross-Talk CH1->CH2 Are supposed equal (estimation of ±12% variation between both) Cross-Talk = (S1b/S2b*S2a/S1a)1/2 Xtalk1= standard Crosstalk Xtalk2= standard Crosstalk measured with a black foil inserted in the saw line The standard production of PMT will certainly provide a quite constant crosstalk between channels: easy to correct IPNO-RDD-Jean Peyré

  8. 2: Study of thin envelops for LaBr3 Xtals with Saint-Gobain R% FWHM @662keV =2.9% R% FWHM @662keV =3.3% diam25x25mm LaBr3 with Standard package (thickness 2mm) 17x17x6mm LaBr3 with Aluminium+Carbon package (thickness < 0,3 mm) IPNO-RDD-Jean Peyré

  9. R3B Calorimeter Target Xm Zc 2.2T Magnet Yc Xc Beam axis 14° Ym Zm 1450mm (0,0,0) m Ym ZC 2.2T Magnet Beam axis YC Xm Zm XC (0,0,0) m R3B Calorimeter 3: Magnetic field R3B Discussion with J.E. Ducret from CEA Saclay on September 24th, 2007 600 Gauss Magnetic field along Zm axis of Magnet IPNO-RDD-Jean Peyré

  10. 3: Magnetic field R3B New meeting with J.E. Ducret on October 31th 2007 People from Saclay are going to simulate the addition of a 2m*2m*10cm iron wall to protect the calorimeter from magnetic field Iron wall 2m*2m*10cm R3B Calorimeter Target Xm Zc 2.2T Magnet Yc Xc Beam axis Ym 14° Zm 1450mm (0,0,0) m Iron cylinder News from J.E. Ducret December 2007: simulation of an iron cylinder around the calorimeter with a clearance of 10 cm around the barrel. iron wall seems not so easy to implement between calorimeter and magnet. IPNO-RDD-Jean Peyré

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